the last proof examined before matter goes to press.
Origin of press proof
First recorded in 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for press proof
Historical Examples of press proof
He was persecuted and vilified every day of his life; but, like my husband, he was press-proof.My Impresssions of America